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From: "sir_nawaz959 at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/59070] Captured object is being moved from the lambda on returning it.
Date: Sun, 10 Nov 2013 18:54:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59070

Sarfaraz Nawaz <sir_nawaz959 at yahoo dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |NEW
         Resolution|WORKSFORME                  |---

--- Comment #4 from Sarfaraz Nawaz <sir_nawaz959 at yahoo dot com> ---
Here is the complete testcase which compiles fine but gives incorrect output:




#include <iostream>
#include <vector>
#include <string>

std::ostream & operator<<(std::ostream & out, std::vector<std::string> const &
items)
{
    for(auto const & item : items ) 
        out << item << " ";
    return out;
}

int main() 
{
    std::cout << "\nGCC " << __VERSION__ << std::endl;

    std::vector<std::string> items {"default"};

    auto add = [=](std::string item) mutable { items.push_back(item); return
items; } ;

    std::cout << add("one") << std::endl;
    std::cout << add("two") << std::endl;
    std::cout << add("three") << std::endl;
}

$ g++-4.8 -std=c++11 -O2 -Wall -pedantic-errors main.cpp && ./a.out

GCC 4.8.1
default one 
two 
three

which is incorrect output